golang binary包

binary包是 golang的二進制包，

a := "hello,this is a first sentence."
//b := "hello,this is a second sentence."

//實例化一個 io容器
by := bytes.NewBuffer([]byte{})
//往里面寫入4個字節的數據
binary.Write(by,binary.BigEndian,int32(len(a)))

var dataLen int32
//讀取4個字節
binary.Read(by,binary.BigEndian,&dataLen)
fmt.Println(dataLen)